720 
Skinner (S.) on the photographic 
action of radium rays, 288; on 
the occurrence of cavitation in 
lubrication, 329. 
Smoluchowshi-Smolan (Prof. M.) on 
the principles of aerodynamics, 
667. 
Solubility of dissociated gases, on 
the, 266. 
Solutions, on the electrical con- 
ductivity and fluidity of, 469. 
Sounds, ona method of mechanically 
reinforcing, 283. 
Spectroscopic notes, 456, 
Spectrum, on the explanation of 
Talbot’s bands in a, 1; on the 
kinetics of a system of particles 
illustrating the line and the band, 
445; on the analysis of bright 
lines of the, 455, 
Stoney (Dr. G. J.) on the escape of 
gases from atmospheres, 690. 
Stresses in a magneto-static field, on, 
399. 
Sutherland (W.) on the dielectric 
capacity of atoms, 402; on the 
Crémieu-Pender discovery, 405; 
on the electric origin of rigidity, 
Al7. 
Talbot’s bands, on a simple ex- 
planation of, 1. 
Temperature, on the effect of, on the 
ionization produced in gases by 
Rontgen rays, 81. 
Thallium, analysis of the bright 
lines in the spectrum of, 501. 
Thermostat, on an electric, 408. 
Thomson (Prof. J. J.) on the struc- 
ture of the atom, 237. 
Thomson effect in alloys of bismuth 
and tin, on the, 560. 
Threlfall (Prof. R.) on a new form 
of sensitive hot-wire voltmeter, 
ov1. 
Tin, on the Thomson effect in alloys 
of, 560. 
INDEX, 
Townsend (Prof. J. 8.) on the charges 
of ions, 276. — 
Transfinite cardinal numbers of 
well-ordered aggregates, on the, 
61; of number-classes in general, 
on the, 294. 
Trouton (Prof. F. T.) on the viscosity 
of pitch-like substances, 347. 
Vaughan (A.) on the Rhetic beds 
of the 8S. Wales direct line, 
514. 
Viscosity of pitch-like substances, 
on the, 347. 
Voltmeter, on a new form of sensi- 
tive hot-wire, 37]. 
Vonwiller (Dr. O. U.) on the di- 
electric constant of water at low 
temperatures, 655, 
Walker (E. E.) on the garnet- 
bearing rocks of the Borrowdale 
series, 79, 
Walker (G. W.) on stresses in a 
magneto-static field, 399. 
Water, on the dielectric constant of, 
at low temperatures, 655.,. 
Watson (Prof. W.) on a quartz- 
thread vertical force magneto- 
eraph, 393. 
Waves, on deep-water two-dimen- 
sional, 609. 
Weintraub (Dr. E.) on the are in 
metallic vapours in an exhausted 
space, 95. 
Whirling of rotating shafts, on the, 
504. 
Wilson (C. T. R.) on the conden- 
sation method of demonstrating 
the ionization of air under normal 
conditions, 681. 
Wireless telegraphy, on the varia- 
tion of potential along the trans- 
mitting antenna in, 124, 
Wood (Prof. R. W.) on some new 
cases of interference and diffrac- 
tion, 376. 
END OF THE SEVENTH VOLUME. 
Printed by Taytor and Francs, Red Lion Court, Fleet Street. 

